Incandescent-lamp socket.



. PATENTED NOV. 24, 1903. G. H. PROGTOR. INCANDESGBNT LAMP SOCKET.

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APPLIUATION ILED SEPT. 15, 1902.

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'No'. 745,294. l PATBNTED Nov. 24, 1903.

' G. H. PROGTOR.

- INGANDESGENT LAMP SOCKET.

APPLIOATION FILED snm. 15, i902.

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4 UNITED STATES Patented November a4, 19031 APATENT OFFICE.

GUY II. PROCTOR, or SOMERVILLE, MASSACHUSETTS, ASSIGNOR To ENGLAND ELECTRIC MANUFACTURING COMPANY, OE BOSTON, MASSA- CHUSETTS, A CORPORATION OE MASSACHUSETTS.

lNCANDEsCENT-LAMP SOCKET.

SPECIFICATION forming part of Letters Patent No. 745,294, dated November 24, 1903.

l VApplication filed September 15, 1902. Serial No. 123,420. (No model.)

To all whom t may concern.-

Be it known that I, GUY H. PROCTOR, a citizen of the United States, residing at Somerville, in the county of Middlesex and State of Massachusetts, have invented new and useful Improvements in Incandescent-Lamp Sockets, of which the following is a specification.

This invention relates to sockets for incandescent lamps, the object of the invention being to provide a simple and practical lampsocket the different parts of which may be quickly and easily removed and fastened together.

The invention consists in the Combination in an incandescent-lamp socket of a supporting-block formed of a single piece of insulating material provided with two transverse passages and a longitudinal passage connecting said transverse passages, said transverse passages having a common longitudinal median plane and separated one from the other by a portion of said block extending therebetween, a circuit-controlling key and a `bearing-plate therefor located in one Of said transverse passages and a key-controlling spring located in the other of said passages.

The invention further consists in the combination and arrangement of parts set forth in the following specification and particularly pointed out in the claims thereof.

Referring to the drawings, Figure 1 is a top plan view of my improved lamp-socket with the key in position to break the circuit. Fig. 2 is a front elevation of the same. Fig. 3 is a view similar to Fig. 2, showing the circuitcontrolling key turned at right angles to the position shown in Fig. 2 and completing the circuit. Fig. 4 is an underneath plan of the same. Fig. 5 is a side elevation viewed from the left of Fig. 3. Fig. 6 is a vertical longitudinal section taken on line 6 6 of Fig. 3.

Fig. 7 is a vertical transverse section taken v on line 7 7 of Fig. 1. Fig. 8 is a vertical transverse section taken on line 8 8 of Fig. 1. Fig. 9 is a perspective view of the circuit-controlling key, together with the bearing-plate upon which the shaft of said key is arranged to rotate. Fig. 10 is a perspective view of the keycontrolling spring. Fig. 11 is a detail front elevation of the insulating supporting-block.

Fig. 12 is a vertical longitudinal section taken on line 12 12 of Fig. 11. tive view of the central contact-plate.

Fig. 13 is a perspec- Fig.

14 is a vertical central section similar to Fig.

6, illustrating a modified means for attaching the lamp to the socket.

Like numerals refer to like parts through- `out the several views of the drawings.

In the drawings, 15 is a supporting-block formed of insulating material. Said supporting-block is provided with two transverse passages 16 and 17, each of said passages extending across and opening through one endofV passages being for-the reception of certain parts, as hereinafter setforth.

The circuit-controlling key 18 consists of a shaft 19, having a handle 2O fast to one end thereof and a rotary contact-block 21 loosely mounted upon the vopposite end thereof in a manner well known to those skilled in the art, with a lost motion between said block and shaft. The shaft 19 is rotatably mounted in bearings 22, provided upon a bearing-plate 23. The bearing-plate 23 has an arm 24 thereon, which is provided with a binding-screw 25, by means of which one of the Wires 27 is attached to said bearing-plate. The arm 24 is located in a recess 26, provided in and extending part way around the periphery of the .supporting-block 15, and the circuit-wire 27 passes through a recess 28, extending from the recess 26 upwardly to the end of the' block l5.

A flat spring 29 is located in the upper transverse passage 16, one end thereof bearing against the rotary contact-block 2lk and the other end thereof being provided with ears.

30, through which screws 3l 31 extend, said screws passing through an insulating-plate 32, located above the spring 29,thence through the ears 30 upon the at spring 29, downwardly through holes provided in the supporting-block 15 and having screw-threaded engagement with ears 33, provided upon the bearing-plate 23. It willthus be seen that the circuit-controlling key, the bearing-plate in which it is rotatably mounted, the bind-v ing-Screw 25, the spring 29, and the insulating-plate 32 are all fastened to the insulating-block l5 by the two screws 31 31.

The screw-threaded shell 34, into which the incandescent lamp (not shown) is screwed, is attached to the supporting-block 15 by two screws 35 35, which pass downwardly through the insulating supporting-block 15, Fig. 8, and have at their lower` ends screw-threaded engagement with an annular contact-ring 36. Said ring 36 and screws 35 clamp the shell 34 against an insulating-Washer 37, said insulating-washer being in turn clamped against the bottom of the supporting-block 15. The contact-ring 36 is provided with an upwardly-extending arm 38, upon which is provided a binding-screw 39, by means of which the second circuit-wire 40 is attached to said arm. Said circuit-wire extends upwardly in a recess 41, provided in the periphery of the snpporting-block 15 and extending longitudinally from top to bottom thereof.

A central contact-plate 42 is clamped by the insulating-washer 37 against the bottom of the block l5 and consists of two horizontal arms 43 and 44, the arm 43 being arranged to bear against one end of the rotary block 21 when the circuit is completed, as in Fig. 6, and the other arm 44 being arranged to bear against the central contact-terminal of the lamp. It will be noted that the arm 43 projects into the transverse passage 17, and being clamped therein, as hereinbefore described, the central contact-plate 42 is held securely in position. The two arms 43 and 44 are connected by a vertical portion 45, which extends through a slot 46, provided in the insulating-washer 37.

When an incandescent electric lamp is screwed into 'the threaded shell 34 and the circuit-controlling key is turned to the position shown in Figs. 3 and 6, the current passes from the wire 27 through the key-shaft 19 and rotary contact-block 2l to the upper arm 43 of the central contact-p1ate42, thence through the lower arm 44 to the central contact-plate terminal of the lamp, passing through said lamp and from the outer terminal thereof to the annular contact-ring 36, thence through the arm 38 to the second circuit-wire 40. The circuit is broken by turning the key from the position shown in Figs. 3 and 6 to that shown in Figs. 1 and 4.

In Fig. 14 I have illustrated a modified form of socket adapted to have attached thereto a Thomson Houston incandescent lamp with a screw-thread provided in the center instead of upon the exterior of the upper end of the lamp. In this modified form of socket the shell 34 is removed and a screw-threaded projection 47 is provided upon the arm 44 of the central contact-plate 42.

Having thus described my invention, what I claim, and desire by Letters Patent to secure, is

l. In an incandescent-lamp socket, a supporting-block formed of a single piece of insulating material provided with two transverse passages and a longitudinal passage connecting said transverse passages, said transverse passages having a common longitudinal median plane and separated one from the other by a portion of said block extending therebetween, a circuit-controlling key and a bearing-plate therefor located in one of said transverse passages, and a key-controlling spring located in the other of said passages.

2. In an incandescent-lamp socket, a supporting-block formed of a single piece of insulating material provided with two transverse passages and a longitudinal passage connecting said transverse passages, said transverse passages having a common longitudinal median plane and separated one from the other by a portion of said block extending therebetween, each of said passages extending across and opening through its respective end of said supporting-block, a circuit-controllingkeyandabearing-plate therefor located in one of said transverse passages, and a key-controlling spring located in the other of said passages.

3. In an incandescent-lamp socket, a supporting-block formed of a single pice of insulating material provided with two transverse passages and a longitudinal passage connecting said transverse passages, said` transverse passages having a common longitudinal median plane and separated onefrom the other by a portion of said block extending therebetweemeach of said transverse passages extending across and opening through its respective end of said supporting-block, said longitudinal passage opening through the periphery of said insulatingblock.

In testimony whereof I have hereunto set my hand in presence of two subscribing Wit- IleSSeS.

GUY I-I. PROGTOR. Witnesses:

CHARLES S. GooDING, ANNIE J DAILEY.

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